Hectograph blanket



Patented Nov. 4, 1952 N T T T S PATENT OFFICE" HE CTOGRAPH BLANKET Irwin Kramsky and Norbert F. Toussaint, Chicago, Ill., assignors to Ditto, Incorporated, Chicago, Ill., a corporation of West Virginia No Drawing. Application March 22, 1948, I I

Serial No. 16,391

9 Claims. (01. 10e 14.5

This invention relates to a gelatinous' composition containingwsorbitol and more particularly to a hectograph blanket. r U

The use of sorbitol to partially replace the glycerin in gelatin hectograph blankets, printing rolls and the like, is known. Sorbitol has the advantage that it greatly increases stability to adverse temperature and humidity conditions. This increased stability is due to the fact that sorbitol has a narrower humectancy range than glycerin. It tends to give off less moisture to a dry atmosphere and take on less moisture from a humid atmosphere than does a corresponding glycerin composition. However, sorbitol has a disadvantage that it imparts tackiness to the All glycol type compounds are suitable, in-

Table I Preferred range in per- Suitable range in per- Matenal cent by weight 4 cent by weight 5% to 9% inclusive 5% to inclusive. 7% to 15% inclusive. 5% to inclusive. 30% to 80% inclusive. 10% to 80%1inclusivc. 15% to 30% inclusive... 10% to inclusive. 5% to 30% inclusivc. 5% to inclusive.

composition so that it is rarely used in amounts greater than 10% by weight of the gelatinous composition. Also in hecto'graph blankets it has the further disadvantag that it decreases copy brightness due to its lower moisture retention capacity as compared with that of glycerin.

An object of this invention is to provide a substantially non-tacky gelatinous composition containing more than about 10% sorbitol.

A further object is to provide a hectograph blanket containing more than about 10% by weight of sorbitol and having satisfactory copy brightness and freedom from tackiness.

Other objects and advantages of the invention will become apparent as the following description progresses.

We have found that tackiness and decreased copy brightness in a gelatinous composition containing sorbitol may be overcome by including in the composition, glycol type solvents such as glycols and glycol others in a concentration of 5 through 70% by weight of the composition, and preferably in a concentration of 5 through 30% by weight of the composition.

The glycol type compounds are eifective in reducing tackiness in compositions containing from 10% to about 60% of sorbitol.

' Example I Specific Material composition Range Gelatin 150 130-195 Glycerin 840 645-975 Water 225 -400 Triethanolamm 45 5-60 Titanium dioxide 8 2-12 Sorbitol 780 600-900 Tripropylene glycol 285 220-330 Example II Specific M ate] lal composition Range 150 -195 935 720-1080 225 100-400 45 5-60 Titanium dioxide 8 2-12 Sorbitol I 780 600-900 Hexylene glycol .5 190 -220 Example III Specific Material composition Range Gelatin 150 130-195 Glycerin. 733 550-840 Water. 225 100-400 Triethanola 45 5-60 Tit ium dioxide. 8 2-12 Sm bitol 780 6 0-900 'lripropylene glycol 196 150-225 Polyethylene glycol (ave weight of 300) 196 150-225 Example IV Specific Material composition Range 150 130-195 537 400-620 225 100-400 45 -(0 8 2-12 780 600-900 'lripropylene glycol 196 150-225 Hexylcne glycol 196 150-225 Polvethylcnc glycol (average molecular I v weight of 300) 196. 150-225 Other ingredients commonly used in hectographblankets, such as tanning agents, may also be incorporated in the compositions.

These hectograph compositions are coated on a cloth or. paper backing in the usual manner. A drying oil such as a linseed oil bonding agent is suitably used to bond the gelatinous copy mass to the backing. The other side of the backing may be coated with a nitrocellulose or other cellulose ester lacquer.

The invention is also applicable to printing rollers, in which case the proportion of gelatin to the liquids is considerably greater than in a hectograph blanket as is well known in the art.

The invention is applicable to any gelatin composition containing sorbitol wherein it is desired to reduce the tackiness caused by the sorbitol.

While there have been shown and described certain embodiments of the invention, it is to be understood that it is capable of many modifications. Changes, therefore may be made without departing from the spirit and scope of the invention as described in the appended claims, in which it is the intention to claim. all novelty inherent in the invention as broadly as possible in view of the prior art.

We claim:

1. A hectograph composition comprising gelatin from 5% to 20%, water from 5% to 50%,

4 glycerin from to 80%, sorbitol from 10% to 60%, and from 5% to 70% of a glycol.

2. A hectograph composition comprising gelatin from 5% to 9%, water from 7% to glycerin from to 80%, sorbitol from 15% to 30%, and from 5% to 30% of a glycol.

3. A hectograph composition comprising gelatin from 5% to 9%, water from 7% to 15%, glycerin from 30% to 80%, sorbitol from 15% to 30%, and from 5% to 30% of diethylene glycol.

4. A hectograph composition comprising gelatin from 5% to 9%, water from 7% to 15%, glyercin from 30% to 80%, sorbitol from 15% to 30%, and from 5% to 30% of polyethylene glycol.

5. A hectograph composition comprising gelatin from, 5% to 9%, Water from 7% to 15%, glycerin from 30% to 80%, sorbitol from 15% to 30%, and from 5% to 30% of polypropylene glycol.

6. A hectograph composition comprising gelatin from 5% to 9%, water from 7% to 15%, glycerin from 30% to 80%, sorbitol from 15% to 30%, and from 5% to 30% of tripropylene glycol.

7. A hectograph composition comprising gelatin. from 5% to 9%, water from 7% to 15%, glycerin from 30% to 80%, sorbitol from 15% to 30%, and. from 5% to 30% of hexylene glycol.

8. A. hectograph composition comprising gelatin from 5% to 20%, water from 5% to glycerin from 10% to 80%, sorbitol from.10% to and from 5% to of a polyalkylene glycol.

9. A hectograph composition comprising gelatin from 5% to 9%, water from 7% to 15%, glycerin from 30% to sorbitol from 15% to 30%, and from 5% to 30% of a polyalkylene glycol.

IRWIN KRAMSKY. NORBERT F. TOUSSAINT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,121,126 Harrison June 21, 1938 2,121,131 Power June 21, 1938 2,164,491 Brown et a1 July 4, 1939 2,255,912. Champion Sept. 16, 1941 FOREIGN PATENTS Number Country Date 292,894 Great Britain June 18,1928 

1. A HECTOGRAPH COMPOSITION COMPRISING GELATIN FROM 5% TO 20%, WATER FROM 5% TO 50%, GLYCERIN FROM 10% TO 80%, SORBITOL FROM 10% TO 60%, AND FROM 5% TO 70% OF A GLYCOL. 